Relative Motion
Physics ⇒ Mechanics
Relative Motion starts at 9 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Relative Motion.
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See sample questions for grade 9
A boat moves north at 10 m/s in a river flowing east at 5 m/s. What is the magnitude of the boat's velocity relative to the ground?
A car moves at 70 km/h east and another at 50 km/h west. What is the velocity of the first car relative to the second?
A person walks at 2 m/s east on a train moving at 8 m/s west. What is the person's velocity relative to the ground?
A person walks at 2 m/s north on a moving walkway going 3 m/s east. What is the magnitude of the person's velocity relative to the ground?
A person walks north at 3 m/s on a moving walkway going north at 2 m/s. What is the person's speed relative to the ground?
A swimmer swims at 2 m/s across a river flowing at 1.5 m/s. What is the resultant velocity of the swimmer relative to the riverbank?
A swimmer swims at 2 m/s in still water. If the river flows at 1 m/s downstream, what is the swimmer's speed relative to the riverbank when swimming downstream?
A train moves at 90 km/h and another train moves in the opposite direction at 60 km/h. What is their relative speed?
Define 'frame of reference' in your own words.
Describe a real-life situation where understanding relative motion is important.
Explain why a person sitting in a moving train appears stationary to another passenger but moving to an observer outside the train.
Explain why the concept of relative motion is important in air travel.
If a bird flies at 10 m/s north and the wind blows at 6 m/s east, what is the bird's speed relative to the ground?
If a bus moves at 50 km/h and a passenger walks towards the back at 3 km/h, what is the passenger's velocity relative to the ground?
If a car moves at 60 km/h and a truck moves at 40 km/h in the same direction, what is the velocity of the car relative to the truck?
If a cyclist moves at 15 km/h and the wind blows in the same direction at 5 km/h, what is the cyclist's speed relative to the ground?
If a person walks at 3 m/s west on a train moving at 10 m/s east, what is the person's velocity relative to the ground?
If a person walks at 4 km/h on a train moving at 40 km/h in the opposite direction, what is the person's speed relative to the ground?
If a person walks at 4 km/h on a train moving at 40 km/h in the same direction, what is the person's speed relative to the ground?
If a person walks at 5 km/h on a train moving at 60 km/h in the same direction, what is the person's speed relative to the ground?
